What Is Kratom & Where Does It Come From?

The Plant

Kratom is the common name for Mitragyna speciosa, a tropical evergreen tree in the Rubiaceae family — the same botanical family as the coffee plant (Coffea). The relationship is at the family level; kratom and coffee are not closely related in the way that, say, lemons and limes are, but they share a common taxonomic ancestor. The connection is mostly a useful reference point: kratom is a plant in the coffee family, not a synthetic chemical or a pharmaceutical product.

Mature kratom trees can reach 25 meters (82 feet) in height, with trunk diameters of nearly a meter. The leaves are large — typically 12–21 centimeters long and 7–12 centimeters wide — dark green, glossy, and ovate. The tree produces small, round clusters of yellow flowers. In its natural habitat, kratom grows in tropical and subtropical climates with rich soil and year-round moisture.

What makes kratom pharmacologically distinctive is its alkaloid content. The leaves contain more than 40 naturally occurring alkaloids, two of which account for most of the plant's known activity: mitragynine (the most abundant, typically 1–2% of dried leaf weight) and 7-hydroxymitragynine (present at trace levels, 0.01–0.05%, but significantly more potent at opioid receptors). These alkaloids interact with the body's mu-opioid receptors in a way that is pharmacologically distinct from classical opioids.

Where Kratom Grows

Kratom is native to the tropical regions of Southeast Asia. The tree grows wild in Indonesia (primarily on the island of Borneo, in the provinces of West, Central, and South Kalimantan, and also on Sumatra, Sulawesi, and Java), Malaysia (Peninsular Malaysia and Malaysian Borneo), Thailand, Myanmar, and Papua New Guinea.

The tree thrives in specific conditions: humid, tropical climates with temperatures consistently above 20°C (68°F), high annual rainfall (ideally 2,000mm+), rich volcanic or alluvial soil, and partial shade during early growth followed by full sun exposure at maturity. These conditions are why kratom is concentrated in equatorial Southeast Asia rather than spreading more broadly.

Nearly all kratom sold in the United States originates from Indonesian Borneo (Kalimantan). Indonesia is the world's largest kratom producer and exporter by a wide margin. The industry supports thousands of smallholder farmers and their families across Kalimantan, where kratom trees grow wild in the jungle and are also cultivated on small plantations.

Despite many strain names suggesting other origins — "Thai," "Malay," "Bali," "Vietnamese" — the vast majority of commercially available kratom, regardless of label, is grown in Indonesian Borneo. These names have become product category labels that describe effect profiles or processing styles rather than actual geographic origins.

Traditional Use

Kratom has been used in Southeast Asia for centuries, long before it entered Western markets. Traditional use was primarily among manual laborers, farmers, fishermen, and plantation workers in Thailand, Malaysia, and Indonesia.

The most common traditional method was chewing fresh leaves directly from the tree. Workers would pluck a few leaves during the workday, strip the central vein, and chew the leaf material. Fresh leaves contain a different balance of alkaloids than dried leaves — some compounds degrade or convert during the drying process — so the traditional experience differs from what modern consumers get from dried powder or extracts.

Brewing kratom tea was the other primary traditional method. Leaves were boiled in water for an extended period, strained, and the resulting tea consumed. This method extracted the water-soluble alkaloids while leaving behind much of the plant fiber. Tea preparation remains popular among modern consumers.

The first Western scientific description of the kratom tree was published by the Dutch botanist Pieter Korthals in 1839, who encountered it during botanical expeditions in Southeast Asia. The tree was subsequently classified and reclassified several times before settling into its current taxonomic position as Mitragyna speciosa Korth.

The Modern Supply Chain

The journey from tree to consumer follows a consistent path. Kratom leaves are hand-harvested by workers who select individual leaves based on maturity — the age of the leaf at harvest is what determines the vein color (white, green, or red) and the resulting alkaloid profile.

After harvesting, leaves are dried using one of several methods: sun drying outdoors, indoor drying in controlled environments, or a hybrid approach. The drying method further modifies the alkaloid composition and is partially responsible for the differences between strains labeled as the same vein color but different regional names. Some leaves undergo additional processing, such as fermentation, which produces yellow and gold varieties.

Dried leaves are milled into powder at processing facilities, either in Indonesia or at U.S.-based manufacturing facilities after import. The powder is then tested (by responsible vendors), packaged, labeled, and distributed to consumers through online stores and, to a lesser extent, brick-and-mortar retail outlets.

The FDA maintains Import Alert 54-15, which allows U.S. customs to detain kratom shipments from overseas without physical examination. This has made the import process more complex, but kratom continues to enter the U.S. in large quantities through licensed importers. Domestic sales are not restricted at the federal level.

Kratom in America

Kratom entered the U.S. market primarily in the 2000s and has grown rapidly since. The American Kratom Association estimates that approximately 15 million Americans currently consume kratom, though independent verification of that number is limited.

The market reached an estimated $1.13 billion in 2023 and has continued growing. The industry has matured significantly from its early days — the establishment of the AKA's GMP certification program, the spread of KCPA legislation across approximately 15 states, and the growing availability of third-party-tested products from certified vendors have all moved the market toward greater legitimacy and consumer protection.

At the same time, kratom remains contentious. The FDA has not approved it for any use and continues to issue warnings. Individual states take dramatically different approaches, from KCPA-style regulation to outright bans. And the emergence of concentrated 7-hydroxymitragynine products has created a new category of regulatory concern that didn't exist in kratom's earlier years in the U.S. market.

For buyers, this environment means that vendor quality, lab testing, and legal awareness are not optional — they're essential. The difference between a safe, well-characterized product and an untested, unverified one is entirely a function of which vendor you choose and whether you take the time to verify their claims.